Office chair



FIG. 1 is a front elevational view of an office chair showing theclaimed new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a right elevational view thereof;

FIG. 5 is a top plane view thereof;

FIG. 6 is a bottom plane view thereof;

FIG. 7 is a front perspective view thereof; and,

FIG. 8 is a rear perspective view.

Any broken lines immediately adjacent to the claimed portions areboundaries, all other broken lines are environmental structures; all thebroken lines form no part of the claimed design.

CLAIM The ornamental design for an office chair, as shown and described.